If you have followed parts I and II of the value discussion, you probably realize these discussions could have as easily been titled: Designing your Paintings.
The shapes of the big patterns of lights and darks (as they go on and off the objects) are more important than the shapes of the objects. Look for them. Design them. Make them happen in new and exciting ways. Make them happen in ways that express your intent or content.
But what about color?
Color is the rest of your life!